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I had a '69 337D with separate (inboard) aux tanks and I now have a '73 337G with the long-range tanks, but only one filler cap per wing. I don't know what the gascolators are. If it's the sump at the bottom of the boom, from where you drain fuel to check for water, then I believe that these sumps have fuel even if the tank selector valves are closed; in other words, the valves are downstream from the sumps.
Because these sumps are the lowest part of the wing, even if a leak is on the upper part of a tank, the fuel may appear to come from the sump area.
I believe that tank cracks can be repaired, but I'm not certain; my A&P is out of the country, so I can't ask him, but maybe someone on this board will tell us.
Ernie
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